Mitigated
I've got mixed feelings, out of the two I bought, one gave up on me in less than 2 years (~625h).
A fairly blatant rise in bad sectors (and a click in my ear :D), which without ZFS parity would have corrupted my data. I'm also quite surprised by the SMR technology, I'd heard that performance could be degraded, and well it's true. For use with large files and for reading, it's fine, but for random writing, it's a disaster.
However, my second one runs very well, without any errors or reallocated sectors.